Running back Roy Helu is out for Saturday’s game at Chicago after he missed his second straight practice with tendinitis in his left Achilles’ tendon, coach Mike Shanahan said Wednesday.

Shanahan said he hopes Helu can return for the third preseason game, Aug. 25 against Indianapolis. The coach also hopes Tim Hightower can play in that game, but said nothing is definite.

Shanahan declined to name a starter for Saturday’s game, but said Evan Royster will receive significant playing time. The coach said Alfred Morris also will get a fair number of carries against the Bears.

Backup outside linebacker Markus White took a shot to the back/rib area and left practice. Shanahan expected him to be OK.

Tackle Trent Williams (bone bruise, left foot) went through a full practice for the first time this week. Williams missed Saturday’s session, was limited to individual drills Monday, and took part in some team drills Tuesday.

Right guard Chris Chester (ankle) went through about half the 11-on-11 drills today, the most action he has seen in more than a week.

Left guard Maurice Hurt (knee) went through most of practice before watching the last part of the session.

Shanahan wasn’t sure of his linemen’s status for Chicago, but all three say they hope to play.

Cornerback Morgan Trent (shoulder, knee) and receiver Lance Lewis (groin) watched practice.